Anaesthetic Circuits - Key Notes

Name	Type	Weight Range	Bag	Co-Axial	Nitrous	Gas flow
Circle system	Closed	10kg and above	Re-Breathing closed	No	No	5-10mls per kg if closed (+10mls if low flow)
To & fro (Waters)	Closed	10kg and above	Re-breathing closed	No	No	5-10mls per kg if closed (+10mls if low flow)
Magill	Semi-closed	7-35kg	Reservoir closed	No	Yes	Circuit factor 1-1.5
Lack	Semi-closed	7-40kg	Reservoir closed	Yes	Yes	Circuit factor 1-1.5
Parallel Lack	Semi-closed	7-40kg	Reservoir closed	No	Yes	Circuit factor 1-1.5
Ayres T piece	Semi-closed	Up to 10kg	None	No	Yes	Circuit factor 2.5-3
Ayres with Jackson Rees mod.	Semi-closed	Up to 10kg	Reservoir open-ended	No	Yes	Circuit factor 2.5-3
Bain D	Semi-closed	10-30kg	Reservoir closed	Yes	Yes	Circuit factor 2.5-3
Bain E	Semi-closed	Up to 10kg	None	Yes	Yes	Circuit factor 2.5-3
Bain F	Semi-closed	Up to 10kg	Reservoir open-ended	Yes	Yes	Circuit factor 2.5-3

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